No PV input from time to time with SPF 5000 ES inverter

[Bastà]

Hello,

Sorry if my English is not good, but I'm a French guy.

I have a problem with my Growatt SPF 5000 ES inverter (firmware 67.03 / 68.03).

From time to time, I no longer have any solar production (see screenshots) while it is still sunny...
I tried to turn off the circuit breakers of the solar panels at the DC protection box, then to put them back, but still nothing.

The next day, the solar production resumes normally.
I have trouble understanding the cause.
Has this already happened to anyone?

For information, I have 4 solar panels connected in series, the grid input and a Pylontech US5000 battery connected to the inverter and the inverter AC output to my home load.
I use SBU mode.
Most of the time everything works well.

Thanks

 

[SeaGal]

Salut et bienvenue!

Do you have any shading issues at those times?

4 panels is not that many, so I am wondering if the minimum voltage for the inverter is not being reached at those times.

Do you have panel specification of Vmp and the inverter's start-up and MPPT voltage ranges to see if they are compatible. If not, an extra panel may be needed.

 

[aliarifat794]

If the voltage from your solar panels exceeds or drops below the inverter's acceptable range, the inverter might shut down solar production to protect itself.

 

[SeaGal]

If the voltage from your solar panels exceeds or drops below the inverter's acceptable range, the inverter might shut down solar production to protect itself.

Wish I'd thought of that

 

[Bastà]

Thank you for your feedback.

I have 4 TrinaSolar 400Wc Vertex S solar panels (characteristic of a panel: Uoc 41.2 V / Umpp 34.2 V) in series, so values x4.
At 6pm in France, I am at 320W of solar production and 123V.

The MPPT voltage range of the inverter is according to the doc: 120 - 430 Vdc

So indeed, it might be necessary to add a panel in series to have a higher voltage.

 

[SeaGal]

So indeed, it might be necessary to add a panel in series to have a higher voltage.

If that is a possibility for you to have 5 panels (ideally of similar V-I characteristics) that would be a better match for your inverter.

 

[Snowmaneu2]

I agree with "seagal" . Plus you may need at least 400 amp hrs of batteries for your inverter